/*
 * (C) Copyright 2013
 * David Feng <fenghua@phytium.com.cn>
 *
 * SPDX-License-Identifier: GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <asm/system.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Generic timer implementation of get_tbclk()
 */
__weak unsigned long get_tbclk(void)
{
    unsigned long cntfrq;
    asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
    return cntfrq;
}

/*
 * Generic timer implementation of timer_read_counter()
 */
__weak unsigned long timer_read_counter(void)
{
    unsigned long cntpct;
#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
    /* This erratum number needs to be confirmed to match ARM document */
    unsigned long temp;
#endif
    isb();
    asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
    asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
    while (temp != cntpct) {
        asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
        asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
    }
#endif
    return cntpct;
}

__weak unsigned long long get_ticks(void)
{
    unsigned long ticks = timer_read_counter();

    gd->arch.tbl = ticks;

    /* increment tbu if tbl has rolled over */
    if (ticks < gd->timebase_l) {
        gd->timebase_h++;
    }

    gd->timebase_l = ticks;
    return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
}

unsigned long usec2ticks(unsigned long usec)
{
    ulong ticks;
    if (usec < 1000) {
        ticks = ((usec * (get_tbclk() / 1000)) + 500) / 1000;
    } else {
        ticks = ((usec / 10) * (get_tbclk() / 100000));
    }

    return ticks;
}
